JP2566748Y2 - Sealed deep groove ball bearings for cell motors - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A sealed deep groove ball bearing for a cell motor according to the present invention is used for rotatably supporting a sleeve, through which a pinion shaft of a cell motor is inserted, inside a housing.

[0002]

2. Description of the Related Art A starter motor for starting an automobile engine energizes an electric motor based on an operation of an ignition switch, and protrudes a pinion which is rotationally driven by the electric motor. Then, the pinion is meshed with a driven gear formed on a flywheel of the engine to rotate the crankshaft of the engine.

FIG. 4 shows an engagement portion between a pinion 1 incorporated in the above-described starter motor and a driven gear 2 formed on a flywheel. The sleeve 5 rotatably supported by the ball bearing 4 inside the housing 3 of the starter motor is driven to rotate by an electric motor (not shown). A spirally inclined female spline groove 6 is formed on the inner peripheral surface of the distal end portion (left end portion in FIG. 4) of the sleeve 5, and the outer peripheral surface of the distal end portion of the shaft 7 to which the pinion 1 is fixed at the distal end is provided.
Male spline groove 8 engaging with female spline groove 6
Are formed respectively.

A compression spring 9 is provided between the inner side surface of the pinion 1 (the right side surface in FIG. 4) and the distal end surface of the sleeve 5.
As long as a rightward force in FIG. 4 is not applied to the shaft 7, the shaft 7 rotates and moves to the distal end side (left side in FIG. 4). However, when the ignition switch is not operated, a large rightward force is applied to the shaft 7 and the shaft 7 is drawn into the sleeve 5 against the elasticity of the compression spring 9.

When the ignition switch is operated to start the engine, the sleeve 5 rotates and the shaft 7 jumps out of the sleeve 5 while rotating, and the pinion 1 fixed to the tip of the shaft 7 and the outer periphery of the flywheel And the driven gear 2 of the section engages. As a result, the rotational force of the shaft 7 is transmitted to the flywheel, the crankshaft of the engine is rotated, and the engine is started. If the ignition switch is slightly returned after the start of the engine, a large rightward force is applied to the shaft 7. Then, at the same time as the shaft 7 is drawn into the sleeve 5, the power supply to the electric motor is stopped, and the rotation of the sleeve 5 and the shaft 7 is stopped.

As described above, when the shaft 7 jumps out of the sleeve 5 when the engine is started, an impulsive thrust load is applied to the ball bearing 4 in the leftward direction in FIG.
Further, when the shaft 7 is retracted into the sleeve 5 after the start of the engine, a shocking thrust load directed rightward in FIG. 4 is applied to the ball bearing 4. Conventionally, a deep groove type ball bearing as shown in FIG. 5 has been used as the ball bearing 4 so as to support such a thrust load in both directions. This deep groove type ball bearing 4 has a deep groove type inner raceway 10 on its outer peripheral surface.
Inner race 11 having an inner race and an outer raceway 12 of a deep groove type on the inner peripheral surface
The inner raceway 10 and the outer raceway 12 are rolled by a press-type retainer 14 having the outer race 13 and the outer race 13.
And a plurality of balls 15 provided so as to be able to roll freely. The outer peripheral surface of the inner race 11 and the outer race 13
Both ends of the space 16 existing between the outer ring 13 and the inner peripheral surface of the outer ring 13 are locked to both ends of the inner peripheral surface of the outer ring 13.
By closing with a pair of seals 19, 19, the space 16
It is trying to prevent garbage from entering inside.

[0007] The sealed deep groove type ball bearing 4 configured as described above.
The inner ring 11 is externally fitted and fixed to the outer peripheral surface of the end of the sleeve 5, and the outer ring 13 is internally fitted to a part of the housing 3.
Step portion 1 in which the front end surface of outer ring 13 is formed in housing 3
7, a retaining ring 18 having a base end face supported by the housing 3.
, Respectively. The step portion 17 supports the thrust load applied to the ball bearing 4 when the engine is started. On the other hand, when the shaft 7 is retracted into the sleeve 5 after the engine is started, the ball bearing 4
The thrust load applied to the support ring 18 is supported by the holding ring 18.

[0008]

However, when a conventional sealed deep groove type ball bearing 4 having a shape as shown in FIG. 5 is incorporated in a starter motor and a thrust load is supported by an outer ring 13, the following problem will occur. Cause problems. That is, after the engine is started, the thrust load applied to the outer ring 13 when the shaft 7 is retracted into the sleeve 5 is supported by the ring 18 so that the pressing ring 18 and the end face of the outer ring 13 must be securely connected. Must be in contact. However, a conventional sealed deep groove type ball bearing 4 as shown in FIG.
Since the width dimension of the end face of the outer ring 13 is small, there is a possibility that the retaining ring 18 and the end face of the outer ring 13 will not come into contact with each other due to improper assembly or the like, and may come into contact with the seal 19. If the retaining ring 18 and the end face of the outer ring 13 do not come into contact with each other, the thrust load cannot be supported by the ball bearing 4, and at the same time, the seal 19 is damaged and the ball bearing 4 is damaged at an early stage. Cause you to

Conventionally, in order to avoid such a danger, the end face of the outer ring 13 is provided with
A washer wider than this end face is abutted, and the end face of the outer race 13 and the retaining ring 18 are opposed via the washer. However, since a washer, which is an extra part, is used, it is inevitable that parts management and assembly work become troublesome.

The above-mentioned problem can be solved by increasing the width of both end faces of the outer race 13 by increasing the thickness of the outer race 13 in the diametric direction on both sides of the outer raceway 12. . However, if the thickness of the outer race 13 is simply increased on both sides of the outer raceway 12, the outer raceway 12 becomes deeper, the cage 14 interferes with the outer race 13 and the ball bearing 4
Can not be adopted because the assembly becomes impossible. The sealed deep groove ball bearing of the present invention eliminates any of the above-mentioned disadvantages.

[0011]

The sealed deep groove type ball bearing for a cell motor according to the present invention comprises an inner ring having a deep groove type inner raceway on the outer peripheral surface, similarly to the above-mentioned conventional sealed deep groove type ball bearing for a cell motor. An outer ring having a deep groove type outer ring raceway on the peripheral surface, a plurality of balls rotatably provided between the inner raceway and the outer raceway, and between an outer peripheral surface of the inner race and an inner peripheral surface of the outer race. And a pair of seals closing both ends of the space existing in the space. The thrust load is provided between the inner peripheral surface of the housing constituting the starter motor and the outer peripheral surface of the sleeve. It is used in a state where a thrust load in the other direction is formed on the housing and is received by a step facing the other end surface of the outer ring. In particular, in the sealed deep groove type ball bearing for the self-motor of the present invention, the inner diameter of the opening at both ends of the outer ring is made smaller at one end surface side of the outer ring, and made larger at the other end surface side, so that the inner diameter of the outer ring becomes larger in the diameter direction. The width of the one end face is made larger than the width dimension of the other end face by making the overall thickness larger at one end face side and smaller at the other end face side than the outer raceway.

[0012]

In the case of the sealed deep groove type ball bearing for a cell motor according to the present invention constructed as described above, since the width of one end surface of the outer ring is large, it is possible to add one to the outer ring without using extra parts such as washers. The thrust load in the direction can be securely supported by the retaining ring. Also, since the thickness of the outer ring in the diameter direction is small on the other end surface side, the depth of the outer ring raceway does not become unnecessarily deep on the other surface side, so that the ball bearing cannot be assembled. Absent. Since the other end surface of the outer race faces the step formed on the housing, the thrust load applied to the outer race in the other direction can be reliably supported without particularly increasing the width of the other end surface.

[0013]

FIG. 1 shows a first embodiment of the present invention.
This sealed deep groove type ball bearing for a cell motor has an inner ring 11 having a deep groove type inner raceway 10 on the outer peripheral surface and a deep groove type outer raceway 12 on the inner peripheral surface, similarly to the above-mentioned conventional sealed deep groove type ball bearing for a cell motor. Rollable between the inner ring raceway 10 and the outer ring raceway 12 while being rotatably held by an outer race 13 having a ring shape and a crown-shaped retainer 14a made by injection molding a synthetic resin. And a plurality of balls 15 provided in the first position. Then, both ends of the space 16 existing between the outer peripheral surface of the inner ring 11 and the inner peripheral surface of the outer ring 13 are
Each of the outer peripheral edges is closed by a pair of seals 19a and 19b which are locked to both ends of the inner peripheral surface of the outer ring 13, thereby preventing dust from entering the space 16. In the case of the structure shown in FIG. 1, each of the seals 19a and 19b is formed by reinforcing an elastic material 20 such as rubber with a core metal 21 to form an entire ring. The outer peripheral edges of the seals 19a and 19b are respectively engaged with engaging grooves 22 and 22 formed in the inner peripheral surfaces of both ends of the outer race 13, and the inner peripheral edges of the seals 19a and 19b are secured to the inner race 11 respectively.
Are in sliding contact with both ends of the outer peripheral surface.

In particular, in the sealed deep groove type ball bearing for a cell motor of the present invention, the inner diameter of the opening at both ends of the outer ring 13 is
The outer ring 13 is small on one end surface 13a side (the right side in FIG. 1) and large on the other end surface 13b side (the left side in FIG. 1).
The thickness of the outer ring 13 in the diametrical direction is made different from each other on both sides of the outer ring raceway 12. The thickness dimension T on the one end surface 13a side is larger than that of the outer ring raceway 12 and the thickness on the other end surface 13b side. The dimension t is reduced. The width dimension W of the one end face 13a is made larger than the width dimension w of the other end face 13b by making the thickness dimension of the outer race 13 different from the outer raceway 12 in this way.

In the case of the sealed deep groove type ball bearing for a cell motor according to the present invention constructed as described above, one end surface 13a of the outer ring 13 is provided.
Since the width dimension W is large, the end face 13a and the retaining ring 18 (see FIG. 4) can be used without using extra parts such as washers.
Are reliably brought into contact with each other, so that the thrust load applied to the outer ring 13 can be reliably supported. In addition, since the thickness of the outer ring 13 in the diameter direction is thin on the other end surface 13b side, the depth of the outer ring raceway 12 does not become unnecessarily deep on the other end surface 13b side. There is no impossibility.
In a state where the outer ring 13 is fitted in the housing 3, the other end surface (the left end surface in FIG. 1) of the outer ring 13 surely faces the step 17 (see FIG. 4) formed in the housing 3. Therefore, the thrust load applied to the outer race 13 in the other direction can be reliably supported without particularly increasing the width of the other end surface.

FIG. 2 shows a second embodiment of the present invention. In the case of this embodiment, the cage 14 made of synthetic resin is used.
The cross-sectional shape of “b” is substantially T-shaped, and a so-called floating seal is constituted by the flange portion 23a formed on one side of the retainer 14b. Accordingly, the seal 19b on the other end surface 13b side in the first embodiment is omitted. In the third embodiment of the present invention shown in FIG.
In the retainer 14c made of synthetic resin, a flange portion 23b is formed on the side opposite to the second embodiment, and a floating seal is formed by the flange portion 23b.
The seal 19a on one end surface 13a side is omitted. Since the other configurations and operations of the second and third embodiments are the same as those of the above-described first embodiment, the same parts are denoted by the same reference numerals and overlapping description will be omitted.

[0017]

The sealed deep groove type ball bearing for a cell motor according to the present invention is constructed and operates as described above, and therefore can reliably support a thrust load without using extra parts such as washers. Therefore, it is possible to reduce the manufacturing cost of the cell motor incorporating the sealed deep groove ball bearing that supports the thrust load in both directions.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial sectional view showing the second embodiment.

FIG. 3 is a partial sectional view showing the third embodiment.

FIG. 4 is a partial sectional view showing an example of a usage state of the sealed deep groove ball bearing for a starter motor according to the present invention;

FIG. 5 is a partial cross-sectional view showing one example of a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pinion 2 Follower gear 3 Housing 4 Ball bearing 5 Sleeve 6 Female spline groove 7 Shaft 8 Male spline groove 9 Compression spring 10 Inner ring raceway 11 Inner ring 12 Outer ring raceway 13 Outer ring 13a One end face 13b Other end face 14, 14a, 14b, 14c 15 Ball 16 Space 17 Step 18 Suppression ring 19, 19a, 19b Seal 20 Elastic material 21 Core bar 22 Locking groove 23a, 23b Flange

Claims (1)

(57) [Scope of request for utility model registration] An inner ring having an inner ring raceway of a deep groove type on an outer peripheral surface, an outer ring having an outer raceway of a deep groove type on an inner peripheral surface, and a plurality of rolls provided between the inner raceway and the outer raceway. number of the balls, closing both ends of the space existing between the outer surface and the inner peripheral surface of the outer ring of the inner ring consists of a pair of seals, the inner peripheral surface of the housing constituting the starter motor and three
Between the outer surface of the sleeve and the sleeve
Out of the above thrust load in one direction
The thrust in the other direction is received by the retaining ring facing one end of the ring.
A load is formed on the housing and applied to the other end surface of the outer ring.
In a sealed deep groove type ball bearing for a cell motor used in a state where it is received in a step portion facing the inside, the inner diameter of the opening at both ends of the outer ring
On the one end side of the outer ring and larger on the other end side.
By making the thickness of the outer race in the diameter direction larger on one end surface side and smaller on the other end surface side than the outer raceway, the width dimension of the one end surface is made larger than the width dimension of the other end surface. Sealed deep groove ball bearings for cell motors .